Setting up GCX (Linux astrometry program)

sudo apt install gcx

GSC ACT catalog

there are a lot of directories with lots of ~50KB files, so it will take a while even with a very fast internet connection.

mkdir ~/gsc-act
cd ~/gsc-act

wget -r -nH --cut-dirs=5 ftp://cdsarc.u-strasbg.fr/pub/cats/I/255/GSC_ACT/

set File > File and Device Options/GSC to /home/username/gsc-act where username is your linux login

Tycho2 star catalog

mkdir ~/tycho2 && cd ~/tycho2

wget -r -nH --cut-dirs=5 ftp://cdsarc.u-strasbg.fr/pub/cats/I/259/

Once you see that they’ve downloaded correctly, do:

zcat tyc2.dat.??.gz >tycho2.dat`

set File > File and Device Options/Tycho2 to /home/username/tycho2 where username is your linux login

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